<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="isAll" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <tr v-for="(item,index) in goodList" :key="index">
          <th>
            <input type="checkbox" v-model="item.checked" @click="changeFn(index)"/>
          </th>
          <th>{{ item.name }}</th>
          <th>{{item.price}}</th>
          <th>
            <button @click="delFn(index)" :disabled="item.num < 1">-</button>
            {{item.num}}
          <button @click="addFn(index)">+</button></th>
          <th>{{item.num*item.price}}</th>
          <th><button @click="del(index)">删除</button></th>
        </tr>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{sum}}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
   import {mapMutations, mapState,mapActions} from 'vuex'
export default {
  watch: {
    goodList: {
        immediate: true,
        deep: true,
      handler() {
        this.sum = this.goodList.reduce((sum,item) => sum + item.price *item.num,0)
        }
    }
  },
  data() {
    return {
      sum:0
    }   
  },
  computed: {
        goodList() {
          // return this.$store.state.goodList
        },
    ...mapState(['goodList']),
    isAll: {
      set(val) {
         this.goodList.forEach(item => item.checked = val)
      },
      get() {
        return this.goodList.every(item => item.checked)
      }
    }
  },
  methods: {
    ...mapActions(['asyncAddNum']),
    ...mapActions(['asyncDelNum']),
    ...mapActions(['asyncDel']),
    ...mapMutations(['changeChecked']),
    addFn(index) {
      this.asyncAddNum(index)
    },
    delFn(index) {
      this.asyncDelNum(index)
    },
    del(index) {
      this.asyncDel(index)
    },
    changeFn(index) {
      this.changeChecked(index)
    }
  }
}
</script>

<style></style>
